Chuck



FIG. 1 is a perspective view of a chuck showing my new design;

FIG. 2 is a side plan elevation view thereof; and,

FIG. 3 is a front plan elevation thereof.

The tool outlined by the dashed lines in FIGS. 1-3 is included to illustrate an associated use and forms no part of the claimed invention. 

The ornamental design for a chuck, as shown and described. 